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PGI Kolloquium:

Prof. Dr. Michael Köhl,
University of Bonn, Germany

PGI Lecture Hall, Building 04.8, 2nd Floor, Room 365

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28.10.2016 11:00 Uhr

Quantum Networking with Quantum Dots and Trapped Ions

Copyright: Prof. Dr. Köhl

Coupling individual quantum systems lies at the heart of building scalable quantum networks. In a quantum network, single quanta are exchanged over macroscopic distances in order to construct secure communication and distributed computing infrastructure. Here, we report the first direct photonic coupling between a semiconductor quantum dot and a trapped atomic ion.

In particular, we demonstrate that single photons generated by a quantum dot controllably change the internal state of a trapped Ytterbium ion. We ameliorate the effect of the sixty-fold mismatch of the radiative linewidths with coherent photon generation and a high-finesse fiber-based optical cavity enhancing the coupling between the single photon and the ion.

The transfer of information presented here via the classical correlations between the z-projection of the quantum-dot spin and the internal state of the ion provides a promising step towards quantum state-transfer in a hybrid photonic network.